Use of mine waste for H2O2-assisted heterogeneous Fenton-like degradation of tetracycline by natural pyrite nanoparticles: Catalyst characterization, degradation mechanism, operational parameters and cytotoxicity assessment

Ali Mashayekh-Salehi, Khatare Akbarmojeni, Aliakbar Roudbari, J.P. van der Hoek, Ramin Nabizadeh, Mohammad Hadi Dehghani, Kamyar Yaghmaeian

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Degradation of tetracycline (TTC) with a heterogeneous Fenton-like pyrite/H2O2 process by pyrite from mine waste as a mineral catalyst was investigated. The study focused on identifying the main oxidizing agents and degradation mechanisms along with operational variables including solution pH, pyrite and H2O2 concentration, contact time, solution temperature, and initial TTC concentration. Catalyst characterization tests revealed that pyrite is a mesoporous powder with a high degree of FeS2 purity. Radical scavenger tests demonstrated that OH was the main oxidizing agent generated by both solution and surface phase reactions. During the pyrite/H2O2 process, more than 85% of TTC was mineralized in 60 min and the maximum TTC removal was attained in the solution at an acidic pH value (4.1). The most abundant transformation products of TTC, formed by the attack of OH radicals, were simple chain carboxylic acids. Cultured cells of human embryonic kidney (HEK) were used for the cytotoxicity assessment of raw and pyrite/H2O2 treated TTC solutions. The results illustrated that the viability of HEK cells was enhanced considerably after treating TTC solutions under optimal conditions. Accordingly, pyrite originating from mine waste is a practically effective and cost-effective catalyst in heterogeneous Fenton-like systems for mineralization and degradation of emerging contaminants such as antibiotics.

Original languageEnglish
Article number125235
Number of pages18
JournalJournal of Cleaner Production
Volume291
DOIs
Publication statusPublished - 2021

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • Cell viability
  • Emerging contaminants
  • Fenton-like
  • Mineralization
  • Pyrite
  • Sulfur defect
  • Tetracycline

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